jon: jennifer griffin at the pentagon. jennifer, thank you. arthel: well the doctor is in and she is here too talk about on an aggressive new strain of norovirus that has been sweeping the global. well it has taken hold here in the u.s. the centers for disease control reports that since september the new strain has caused more than 140 outbreaks nationwide. norovirus spreads quickly through large groups and causes bouts of volume iting and -- vomiting and diarrhea. we have lee van nokia cure, lsu health science center at shreveport. how are you doing. >> good. how are you? arthel: i am but a lot of people aren't. that doesn't sound very good symptoms you get from the norovirus. how else can you tell us in terms of how this virus attacks the body. >> what is interesting, every couple a years a new strain comes about. this was coincidentally during the peak of influenza this spiked. early on when we were hering about people that had the flu but had nausea, vomiting and diarrhea, it was probably they were infected with the norovirus. and the noro